Merge pull request #920 from ninjarobot/master

Adding docs for official SWI-Prolog image.

swipl/README-short.txt

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+SWI-Prolog offers a comprehensive free Prolog environment.

swipl/content.md

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+# What is SWI-Prolog?
+
+SWI-Prolog is a versatile implementation of the Prolog language. Its robust multi-threading, extended data types, unbounded arithmetic and Unicode representation of text allow for natural representation of documents (e.g., XML, JSON, RDF) and exchange of data with other programming paradigms.
+
+> [wikipedia.org/wiki/Prolog](https://en.wikipedia.org/wiki/Prolog)
+
+%%LOGO%%
+
+# How to use this image
+
+## Start a REPL
+
+This image can be run directly to obtain an SWI-Prolog environment with most useful modules pre-built. When started without parameters, the SWI-Prolog REPL is launched automatically:
+
+```console
+docker run -it %%IMAGE%% 
+```
+
+## Build an image with your application
+
+It is also useful to build images on top of this base image which rely on SWI-Prolog and provide their own default command:
+
+```dockerfile
+FROM %%IMAGE%%
+COPY . /app
+CMD ["swipl", "/app/start.pl"]
+```
+
+This will extract and copy your source files to the image and then set the default command to run your application.

swipl/github-repo

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+https://github.com/SWI-Prolog/swipl-devel

swipl/license.md

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+View the [Simplified BSD license](http://www.swi-prolog.org/license.html) for the software contained in this image.

swipl/maintainer.md

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+[the SWI-Prolog community](%%GITHUB-REPO%%)